E-mail: authentic013@steelpipes-fitting.com
WhatsApp: +86 13668807131
E-mail: authentic013@steelpipes-fitting.com
WhatsApp: +86 13668807131
Oct. 08, 2024
With the rapid development of the economy and the continuous improvement of energy demand, pipelines for oil and gas resources have seen significant advancements in recent years. Several medium-caliber Electric Resistance Welded (ERW) line pipe units have been completed and are now operational. ERW line pipes are widely utilized in oil and gas field gathering pipelines and spur lines. This article will focus on the impact of circumferential residual stress on the manufacturing process of ERW line pipes, as well as its implications for product quality and control.
The ERW pipe forming process can be divided into two phases: the first stage involves deformation, while the second stage focuses on reducing distortion. Throughout both phases, the inner layer of the steel pipe experiences circumferential compressive stress and deformation, while the outer layer undergoes tensile stress and extension deformation during fine shaping and sizing processes. Consequently, there are differences in final strain between the inner and outer layers of ERW pipes, indicating an inconsistency in circumferential strain.
Uneven Deformation: The manufacturing process often leads to uneven bending deformation, resulting in significant residual stress. It is essential to implement measures to mitigate the negative impacts of residual stress on the manufacturing process.
Residual Stress Analysis: The study and control of residual stress should extend beyond just detecting and analyzing the final product. It is crucial to analyze the forming process of ERW pipelines from a process control perspective to reduce residual stress and its adverse effects on product quality.
Sizing Importance: Sizing ensures that the pipe diameter meets specifications, while hydrostatic testing confirms the density of the steel pipe. For ERW pipelines, these processes are also vital for reducing circumferential residual stress.
Understanding the manufacturing process of ERW pipes, particularly regarding circumferential residual stress, is critical for ensuring high-quality products. By addressing common issues during production and focusing on effective control measures, manufacturers can enhance the performance and reliability of ERW line pipes in various applications.
Previous: Knowledge of ERW line pipe
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